XP328 Whirlwind HCC.12 32 Squadron, RAF Northolt | par Stuart Freer - Touchdown Aviation. It was a HCC10 actually. We had three HCC10s and one HCC12. The HCC10 was an HAR10 with the winching gear removed and a VIP interior installed. Cabin soundproof sidewall and ceiling linings, red carpet and airline seats. The HCC12 was ex-Royal Flight and was based on the civil S55 Series 3T specifications. You can tell it apart from the 10s by its double windows.